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A320405
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Number of nX4 0..1 arrays with every element unequal to 0, 1, 2, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
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1
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8, 35, 156, 786, 3761, 18725, 92578, 463045, 2308299, 11536977, 57665448, 288255915, 1441171251, 7205071761, 36023566370, 180108084412, 900499990791, 4502306264686, 22510579308742, 112548275061883, 562718206201266
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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Empirical recurrence of order 83 (see link above)
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EXAMPLE
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Some solutions for n=5
..0..0..1..1. .0..0..1..0. .0..1..1..1. .0..1..1..1. .0..0..1..1
..0..1..1..1. .1..0..0..0. .0..1..1..1. .1..1..1..1. .0..1..1..0
..0..0..1..1. .0..0..1..0. .0..1..1..1. .1..1..0..1. .1..1..0..0
..1..1..1..0. .0..1..0..1. .0..1..0..0. .1..1..0..1. .0..1..1..1
..1..1..0..0. .0..0..1..1. .0..0..1..0. .1..1..1..0. .1..1..1..1
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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